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Why you have to modulate the signal?

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Wiki User
2007-12-05 12:37:16

Sometimes we have to send low frequency information, like the

tone of the voice of someone talking on a telephone, over a

specific channel that only permits a specific high frequency, such

as radio frequencies (RF). So how do we do that? One simple, cost

effective, and bandwidth efficient method is to change, or

modulate, a known RF signal a certain way. Some common ways of

modulating such a high frequency signal are Amplitude Modulation

and Frequency Modulation. Each of these modulation techniques has

its own advantages and disadvantages and are therefore more useful

in certain applications.

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